Improvement in collapsing-cores



einem gaat atrnt chimica ANTHONY vT. BRODIE AND VROBERI R. SMITH, 0F PITTSBURG,

' PENNSYLVANIA.

Letters Patent No. 111,1l3, dated January 24, -1871.

IMPROVEMENT IN COLLAPSING-CORES.

The Schedule referred to in these Letters Patent and making part: of the same;

'ROBERT It. SMITH, vboth of Pittsburg, in the county4 of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Metallic- Core; and we do hereby declare that the following chains, which are secured to the upper end of sections A, B, and D; but we wish it clearly understood that is a full, clear, `and exact description thereof,` reference being had to the accompanying drawing and to the letters of reference. marked thereon.

The nature of our invention consists in a metallic core, so constructed that it will yield to the contraction of the article cast while'casting and during the process of cooling, and also, susceptible of being co1- lapsed for the purpose of removing the corefrcm the casting.

To enable others skilled in the art to make and use our invention, we will 'proceed to describe more fully itsl construction and operation.

In the accompanying drawing which our specification- Figure 1 is a side elevation of our improvement in metallic core.

Figure 2 represents three parts of thesame, showing the relation that said parts bear to eachother when the core is 'y collapsed, and also lwhen it is expanded to its greatest diameter'.

- Figure 3 represents the inside of one of the main sections of the metallic core.

Figure 4 is a transverse section of the metallic core when cut through at line y of fig. 1.

In the accompanying drawing-` A, B, and D are the three main sections ofthe core. Thesesections are each a longitudinal sectior of a tube, and are braced with a series of stays, c, on the inside, as clearly shown in iig. 3.

Between the main sections A, B, and D are placed the sections C, the sides -of-` which are beveled and fitted to the edges of the sections A, B, and D, as shown in fig. 4. Y

The inner side of the sections C are provided with a series of inclines, j, which are used, in combination with the springs 71, for expanding the core to its greatest diameter, and also for collapsing Yit for the purpose of removing it from the casting.

The springs h are secured to the shaft g by means of set-screws, and may be' easily removed for other purposes. v

The shaft gis provided with a tongue or guide, n, which is tted to a groove, m, in the end of the section D, shown in iig. 3, and is also provided with an enlargement or shouldena, which, in connection with ythe end piece s of the sections A, B, and D, limits the movement ofthe shaft g endwise. I

forms part of ydinary manner.

The tongue or guide a and groove m prevent the shaft g from turning in the core. The several parts are `held in juxtaposition through the medium of the rings k and pins or set-screws l.

.The core herein described and representedis for pipe; hence it is represented'as being snspendedby we do not confine ouriuvention to pipe-cores, for it may be applied to a great number of other articles.

As the construction and arrangementof the several parts of our improvement in metallic-core, and the relation that said parts -hear to4 each other, will beJ readily understood from the foregoing description, andv by reference to the accompanying drawing, we will therefore proceed to describe its operation.

The core is expanded toits proper diameter by forcing down or in the shaft g, which will cause the springs lt to move and press on the inclines f of the sections,

which will press them outward, 'andthereby expand the sections A, B, and I) to the proper degree for obtaining the diameter of the core.

The core'is then coated witlra suitabie material,

-' (such as is in common use in foundries for coating sand-cores and dry-sand molds;) the core is then placed in a core-oven and dried. It is then ready for use,

The core is placed in the mold in theusnal inanner, and the vent carried off at the end iu the o1'- In the process of casting, the metal commences to contract as soon as it comes iu contact with the core. To compensate for this contraction the springs 7i. and inclines fare used. i

The pressure of the casting in contracting, coming on the main sections A, B, andv D, will be thrown on the sections O and force them in against the springs fh, which will'yield sufficient to allow the-. c ore to gradually contract' its diameter so as to compensate for the contraction of the casting in cooling.

\Vhen the core is to be moved from the casting, the operator takes hold ofthe ring t of shaft g, and draws it endwise. rIhiswill cause lthe core to collapse, so that it may be readily. removed from the casting.

When the core is collapsed, thesprings h are drawn offithe inclines f, as indicated 'by the position of section O on the left-hand side of shaftg, in iig. '2.

When the core is expanded to its greatest diameter, the springs h are on the iuclines f, as indicated by theposition of section G on the right-hand side of shaft g,'as shown in iig. 2.

The advantage of our metallic core consists in saving labor and expense of making anew core for each casting, the advantage of which will be very apparent whole being so constructed as to yield, as and for the to thc skill-ful molder and manufacturer of castings.

purpose herein described. Having described the nature, construction, and op- A. T. BRODIE.

eration of our imprcvement, R. R. SMITH.

What We claim as of our invention is L v A metallic core, consisting of thc parts A B D C and shaft g, provided with springs h, said parts being held together by rings k and pins or screws l, the

Witnesses:

A. G. JOHNSTON, JAMES J. JOHNSTON. 

